Related:

• He that plants thorns must never expect to gather roses.
  -- Pilpay (or Bidpai) -- The Ignorant Physician, Chap. iii, Fable viii...
• Those who would have nothing to do with thorns must never attempt to gather flowers.
• Never give advice in a crowd. -- Arab Proverb
• Trees often transplanted never prosper. Arab Proverb
• Memory is the power to gather roses in winter.
• No man is a good physician who has never been sick. Arab Proverb
• He who has health has hope; and he who has hope, has everything. Arab Proverb
• If you stop every time a dog barks, your road will never end. Arab Proverb